Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d79d439be707724…

MALICIOUS

PDF

83.9 KB Created: 2021-07-18 21:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 95b3890e2407c1e20ae78163f67b47d0 SHA-1: 2b716c42804fc7e0fed4077802fca513e975486a SHA-256: 2d79d439be70772405c94a99dd3dc8957a0327e0052457b75e4fb8abb058e60e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/werelekazox.pdf In PDF document text
    • https://mfdesign.hu/files/file/kedefure.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c1b405125---joposaruzifef.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/58133472734.pdfIn PDF document text
    • https://dm288.rs/slicice/file/39043501632.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/82260965592.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1bf89d72a3267538cb77178c6676d3e2/kazepuwer.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34cd189d4---26153463937.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/dawanolajowumilewu.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/busedeninixalotumigutiba.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/zolujapoput.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/35260121991.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ddec8ca37---34711295298.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/qp2ut2r7auq31po7aj4b7b9o07/84555456275.pdfIn PDF document text
    • https://migger.dk/userimages/file/9743994169.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/52093087465.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b954dd08de6cd2df03b202dc7d710387/8501294469.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/26745774972.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/82364194984.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/dogirakudelorok.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160791eac61d2b---meluve.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcdde0d6ff---79210465676.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/74286964682.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/6v87fcfnlbe3f3utm544sgefn3/farojimilibo.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/94761996917.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/f0f18ca8ce06abc8d0399e177d0b522b/posigew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+write+mixed+numbers+in+simplest+formPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE252 17756 bytes
SHA-256: 1094691730c754b21a86c4f89772504217df2bb7865e4bf27c53f616025ad54f
font_01_sfnt_off000110fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 10916 bytes
SHA-256: 4e7c9e7cd08e9ba643762e3ada025a31ac0a7df7b403eed387732906b7ef5c8c

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